A switching control circuit of a power converter according to the present invention comprises an input circuit and a clock generator. The input circuit is coupled to receive a feedback signal for generating a switching signal. The clock generator generates a clock signal to determine a switching frequency of the switching signal. The feedback signal is correlated to an output of the power converter. The switching signal is coupled to switch a transformer of the power converter for regulating the output of the power converter. The pulse width of the switching signal is reduced before the switching frequency of the switching signal is changed from a low frequency to a high frequency.
Legal claims defining the scope of protection. Each claim is shown in both the original legal language and a plain English translation.
1. A switching control circuit of a power converter, comprising: a switching circuit coupled to receive a feedback signal for generating a switching signal; and a clock generator generating a clock signal to determine a switching frequency of the switching signal; wherein the feedback signal is correlated to an output of the power converter; the switching control circuit generates the switching signal to switch a transformer of the power converter for regulating the output of the power converter; when the switching control circuit operates at a same load state before the switching circuit increases the switching frequency of the switching signal the switching circuit first decreases a pulse width of the switching signal to resolve a limitation of a synchronous rectifier of the power converter.
A switching control circuit for a power converter regulates the converter's output by switching a transformer using a switching signal. This circuit includes a switching circuit that generates the switching signal based on a feedback signal correlated to the power converter's output, and a clock generator that determines the switching frequency of the switching signal. Before the switching frequency is increased at the same load state, the circuit first reduces the pulse width of the switching signal to address limitations in the power converter's synchronous rectifier.
2. The circuit as claimed in claim 1 , wherein the pulse width of the switching signal is reduced before the switching signal is disabled.
The switching control circuit from the previous description further reduces the pulse width of the switching signal before completely disabling the signal. This reduction in pulse width occurs before the signal is shut off.
3. The circuit as claimed in claim 1 , wherein the pulse width of the switching signal is decreased to a specific value before the switching signal is disabled for the protection of the power converter.
The switching control circuit from the first description decreases the pulse width of the switching signal to a specific value before disabling the signal. This disabling with a reduced pulse width is done to protect the power converter.
4. The circuit as claimed in claim 1 , wherein the switching circuit modulates the pulse width of the switching signal step by step in response to the feedback signal.
The switching control circuit from the first description adjusts the pulse width of the switching signal incrementally, in direct response to changes in the feedback signal it receives.
5. The circuit as claimed in claim 4 , wherein the switching circuit further comprises a feedback circuit, the feedback circuit receives the feedback signal to generate an attenuated feedback signal, the switching circuit generates a modulated feedback signal in accordance with the attenuated feedback signal for generating the switching signal.
The switching control circuit, which modulates the pulse width of the switching signal step by step in response to the feedback signal, also includes a feedback circuit. This feedback circuit receives the feedback signal and generates an attenuated version of it. The switching circuit then generates a modulated feedback signal based on this attenuated feedback signal, ultimately generating the switching signal.
6. The circuit as claimed in claim 5 , wherein the switching circuit further comprises a logic circuit generating the switching signal in response to the modulated feedback signal and the clock signal.
The switching control circuit, which uses an attenuated feedback signal to modulate the switching signal, also contains a logic circuit. This logic circuit generates the switching signal based on both the modulated feedback signal and the clock signal from the clock generator.
7. The circuit as claimed in claim 1 , wherein the power converter comprises the synchronous rectifier at a secondary side of the transformer.
The switching control circuit from the first description is used in a power converter that contains a synchronous rectifier located on the secondary side of the transformer.
8. A control circuit of a power converter, comprising: a switching circuit coupled to receive a feedback signal for generating a switching signal; wherein the feedback signal is correlated to an output of the power converter; the switching signal is coupled to switch a transformer of the power converter for regulating the output of the power converter; the switching circuit changes its output step by step in accordance with its input signal, when the control circuit operates in a protection state the switching signal is disabled and a pulse width of the switching signal is decreased before the switching signal is disabled, when the control circuit operates at a same load state before the switching circuit increases a switching frequency of the switching signal the switching circuit first decreases the pulse width of the switching signal to resolve a limitation of a synchronous rectifier of the power converter.
A control circuit for a power converter regulates the output using a switching signal to switch a transformer. The switching circuit generates the switching signal based on a feedback signal that is correlated to the converter's output. The switching circuit adjusts its output in steps according to its input signal. In a protection state, the switching signal is disabled, but the pulse width is reduced before disabling it. Under the same load, before the switching frequency is increased, the pulse width is first decreased to accommodate limitations of a synchronous rectifier in the power converter.
9. The circuit as claimed in claim 8 , wherein the power converter comprises the synchronous rectifier at a secondary side of the transformer.
The control circuit from the previous description is used in a power converter that includes a synchronous rectifier on the secondary side of the transformer.
10. The circuit as claimed in claim 8 , further comprising: a clock generator generating a clock signal to determine a switching frequency of the switching signal.
The control circuit from the eighth description also includes a clock generator. This clock generator creates a clock signal that determines the switching frequency of the switching signal.
11. The circuit as claimed in claim 8 , wherein the pulse width of the switching signal is decreased to a specific value before the switching signal is disabled for the protection of the power converter.
The control circuit from the eighth description further decreases the pulse width of the switching signal down to a specific value before completely disabling it to protect the power converter.
12. A controller of a power converter, comprising: a switching circuit coupled to receive a feedback signal for generating a switching signal; and a protection circuit coupled to disable the switching signal in response to the protection of the power converter; wherein the feedback signal is correlated to an output of the power converter; the switching signal is coupled to switch a transformer of the power converter for regulating the output of the power converter; when the controller operates in a protection state the switching signal is disabled and a pulse width of the switching signal is decreased before the switching signal is disabled, when the controller circuit operates at a same load state before the switching circuit increases a switching frequency of the switching signal the switching circuit first decreases the pulse width of the switching signal to resolve a limitation of a synchronous rectifier of the power converter.
A controller for a power converter comprises a switching circuit and a protection circuit. The switching circuit generates a switching signal based on a feedback signal linked to the power converter's output, and switches a transformer to regulate this output. The protection circuit disables the switching signal for power converter protection. When the controller is in a protection state, the switching signal is disabled only after its pulse width is decreased. Before the switching frequency is increased at a constant load state, the pulse width of the switching signal is reduced to accommodate limitations of a synchronous rectifier within the power converter.
13. The controller as claimed in claim 12 , wherein the power converter comprises the synchronous rectifier at a secondary side of the transformer.
The controller described above, which includes pulse width adjustments and protection mechanisms, is used in a power converter incorporating a synchronous rectifier located on the secondary side of the transformer.
14. The controller as claimed in claim 12 , further comprising: a clock generator generating a clock signal to determine a switching frequency of the switching signal.
The controller from the twelfth description additionally contains a clock generator. This clock generator generates a clock signal that determines the switching frequency of the switching signal.
15. The controller as claimed in claim 12 , wherein the pulse width of the switching signal is decreased to a specific value before the switching signal is disabled for the protection of the power converter.
The controller from the twelfth description decreases the pulse width of the switching signal to a specific value before disabling it for protection.
16. The controller as claimed in claim 12 , wherein the switching circuit is coupled to receive the feedback signal for generating the switching signal; the switching circuit is coupled to modulate the pulse width of the switching signal step by step in response to the feedback signal.
In the controller from the twelfth description, the switching circuit receives the feedback signal to generate the switching signal, and modulates the pulse width of the switching signal step by step according to changes in the feedback signal.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
April 22, 2013
September 12, 2017
Browse 5M+ US patents with plain-English claim translations and AI-generated analysis.